linuxrwlocks/testcase_full.c

   1 #include <stdio.h>
   2 #include <threads.h>
   3 #include <stdatomic.h>
   4 #include "wildcard.h"
   5
   6 #include "librace.h"
   7 #include "linuxrwlocks-wildcard.h"
   8
   9 rwlock_t mylock;
  10 int shareddata;
  11
  12 atomic_int x, y;
  13
  14 static void a(void *obj)
  15 {
  16         write_lock(&mylock);
  17         atomic_store_explicit(&x, 17, relaxed);
  18         write_unlock(&mylock);
  19
  20         if (!read_can_lock(&mylock))
  21                 return;
  22         if (read_trylock(&mylock)) {
  23                 atomic_load_explicit(&x, relaxed);
  24                 read_unlock(&mylock);
  25         }
  26 }
  27
  28 static void b(void *obj)
  29 {
  30
  31         if (write_trylock(&mylock)) {
  32                 atomic_store_explicit(&x, 16, relaxed);
  33                 write_unlock(&mylock);
  34         }
  35
  36         read_lock(&mylock);
  37         atomic_load_explicit(&x, relaxed);
  38         read_unlock(&mylock);
  39 }
  40
  41 int user_main(int argc, char **argv)
  42 {
  43         thrd_t t1, t2;
  44         atomic_init(&mylock.lock, RW_LOCK_BIAS);
  45         atomic_init(&x, 0);
  46         atomic_init(&y, 0);
  47
  48         thrd_create(&t1, (thrd_start_t)&a, NULL);
  49         thrd_create(&t2, (thrd_start_t)&b, NULL);
  50
  51         thrd_join(t1);
  52         thrd_join(t2);
  53
  54         return 0;
  55 }